The management of mobikwik is very clever. they have the idea to trap the mobile users. So first of all they get money in the wallet. After refilling money their promo code is to be applied which never works. Now you are trapped and have no option for profitable exit. On other recharge site, promo code is applied before payment is made, there you have the option to stop your payment if promo code is not working. In this way mobikwik is a cheater site.